There are many azaleodendrons, both new as well as old cultivars, which were not mentioned in the "Quarterly Bulletin No. 4, 1977", page 229-232. In order to render the survey as complete as possible for those particularly interested in azaleodendrons, an additional list follows.
Perhaps I should say that I have been working for the past 17 years with rhododendrons and azaleas consisting of almost 1700 different cultivars and species situated in Bad Zwischenahn near the town of Oldenburg.
This collection was started in 1962 in Aurich/Ostfriesland (a part of the State Niedersachsen). The collection was moved in 1975 to the small town Bad Zwischenahn in the Country "Amerland". This area is a center of more than 400 nurseries, which grow azaleas, rhododendrons, conifers and so-called better shrubs and trees such as Hamamelis, Magnolias, Japanese maples, Cornus and so on, in an area of 1800 ha (4500 acres). The garden measures three hectares (7.5 acres) and contains about 5000 bushes of rhododendrons and azaleas and, in addition, many conifers. The owner of this garden is the Landwirtshaftskammer Weser-Ems, or in your Language Chamber for Agriculture Weser-Ems, for which I am working. It is a research and experimental garden particularly to test new and old hybrids under German conditions.
The following azaleodendrons are listed in the same succession of groups as in Dr. Kehr's record.

Parents

Cultivar Name (if any)
or Source

Developer and Date

I(a) Deciduous Azalea x Evergreen Azalea

1. 'Harvest Moon' ♀ x
'Johann Seb. Bach'

'Gnom'

Carl Fleischmann, ca 1965

2. 'Harvest Moon' ♀ x
'Johann Seb. Bach'

'Kobold' not Glenn Dale

Carl Fleischmann, ca 1965

3. 'Harvest Moon' ♀ x
'Johann Seb. Bach'

'Perkeo'

Carl Fleischmann, ca 1965

I(b) Deciduous Azalea x Non Scaly Rhododendron

1. 'Mortieri' xR. caucasicum or
'Caucasicum Album'

'Alstroemerioides' also called
'Alstroemeriaeflorum' or
'Alstroemeriaeflora'

Unknown, before 1860

2. R. nudiflorum ♀ xR. catawbiense

'Cartonii' too called
'Cartonianum'

Carton, 1825

Isaac Davies, before 1881

3. R. japonicum x unknown
evergreen hybrid

'Elegantissimum'

4. R. viscosum ♀ x R. ponticum

'Onatum'

Gowen, exhibited 1832

5. White flowered azalea ♀ xR. ponticum

enneandrum also called
enneandra

Unknown, before 1861

11(b) Evergreen Azalea x Non Scaly Rhododendron

1. Seedling of Indian
azalea ♀ x unknown
rhododendron hybrid

'Baronin LiIIa Kister'

Carl Schulz, before 1866

II c Evergreen Azalea x Scaly Rhododendron

1. Indian azalea
'Magnifica' x 'Comet'

'Alba Plen a Odorata'

Oskar Hartl, before 1892

III(a) Non Scaly Rhododendron x Deciduous Azalea

1. R. ponticum ♀ x
Indian azalea

'Frau Minna Hartl', the name
'Frau Minna Hartl' is not correct

Oskar Hartl, 1891

2. unknown rhododendron
x unknown azalea

'Torlonianum', Rehder suggests
it is R. calendulaceumcrossed with R. catawbiense

A. van Geert, before1845
(breeder was not M Young)

3. R. catawbiense ♀ x
yellow Ghent azalea

'Deception'

Standish & Noble, 1850

4. R. catawbiense x
R. viscosum

'Fragrans'

Paxton of Chandler & Sons,
1843

5. Unknown rhododendron x
fragrant azalea

'Roseum Odoratum'

Isaac Davies before 1884

6. Unknown rhod. hybrid
x R. japonicum

'Rhodoazalea'
crouxii

Croux & Fils 1908

7. 'Prince Camille de Rohan'
or 'Leopold' xR. japonicum

'Dr. Wittmack'

G. Van der Meuen,
first exhibited 1892

8. 'Prince Camille de Rohan'
or 'Leopold' xR. japonicum

'Directeur Rodigas'

G. Van der Meuen,
first exhibited 1892

9. 'Prince Camille de Rohan'
or 'Leopold' xR. japonicum

'Edouard Andre'

G. Van der Meuen,
first exhibited 1892

10. 'Prince Camille de Rohan'
or 'Leopold' xR. japonicum

'Jules Closon'

G. Van der Meuen,
first exhibited 1892

11. 'Prince Camille de Rohan'
or 'Leopold' xR. japonicum

'Comte de Kerchove'

G. Van der Meuen,
first exhibited 1892

12. R. arboreum xR. molle

'Carneum'

unknown, before 1871

13. parents probablyR. maximum x R. ponticum x R. molle

'Aureum Magnificum'

William Smith, Norbiton
Common, between 1830 and
1840

14. parents probablyR. maximum x R. ponticum x R. molle

'Aureum Punctatum'

William Smith, Norbiton
Common, between 1830 and
1840

15. parents probablyR. maximum x R. ponticum x R. molle

'Aureum Superbum'

William Smith, Norbiton
Common, between 1830 and
1840

16. parents probablyR. maximum x R. ponticum x R. molle

'Album Flavum'

William Smith, Norbiton
Common, between 1830 and
1840

17. parents probablyR. maximum x R. ponticum x R. molle

'Blanca'

William Smith, Norbiton
Common, between 1830 and
1840

These cultivars are listed in "Henderson's Illustrated Bouquet" (1857-1864)

18. parents probablyR. maximum x R. ponticum x R. molle

'Burlingtonii'

19.parents probablyR. maximum x R. ponticum x R. molle

'Carneum Versicolor'

20. parents probablyR. maximum x R. ponticum x R. molle

'Congestum Aureum'

21.parents probablyR. maximum x R. ponticum x R. molle

'Cupreum'

22. parents probablyR. maximum x R. ponticum x R. molle

'Delicatum Aureum'

23 parents probablyR. maximum x R. ponticum x R. molle

'Gloriosum'

24 parents probablyR. maximum x R. ponticum x R. molle

'Jenkins'

25 parents probablyR. maximum x R. ponticum x R. molle

'Micranthum Flavum'

26.parents probablyR. maximum x R. ponticum x R. molle

'Primulinum Formosum'

27. parents probablyR. maximum x R. ponticum x R. molle

'Primulinum Elegans'

28. R.? x R. molle

'Aureum Splendidum'

29. R. arboreum x R. molle

'Carneum Elegantissimum'

30. R. ? x R. molle?

'Chrysolectum Grandidissimum'

Azaleodendrons with parentage unknown'Joy's Delight', probably a hybrid of J. H. Mangles
'Gemmiferum', parents and origin unknown, J. Waterer, before 1861
Rehder suggests it might be a hybrid between the azalea R. prinophyllum (R. roseum) and R. catawbiense.
But in my opinion the assumption of Rehder is very probably incorrect because there is no visible influence of R. catawbiense or R. prinophyllum.
'Konigin Cleopatra', a hybrid with an Indian azalea, Carl Schulz, 1867